Idle Control Hardware
Open Idle > Idle hardware. Enable Use Stepper only for a stepper motor. Hardware changes require an ECU reboot. Pin selectors are not a universal wiring diagram; use the installed board and revision documentation.
Solenoids
Single wire
Select one board-supported PWM output as Idle Solenoid Primary output. Open loop, adders, and feedback corrections produce its commanded percentage. With the engine stopped and no idle bench test active, both solenoid channels are commanded to zero.
Dual wire
Enable Double Solenoid Mode and configure Idle Solenoid Secondary output. Both outputs use the idle frequency and are driven in complementary directions as position changes. The runtime raises a configuration error if the secondary output is missing.
PWM frequency
Idle Solenoid Frequency applies to both solenoid outputs at hardware initialisation and requires the indicated ECU restart. Use the valve or driver manufacturer's supported frequency.
Stepper Motors
The final idle percentage becomes a target from zero to Stepper total steps. Select one of these driver paths:
Dedicated stepper hardware
Leave both Drive stepper with dual H bridges and Drive stepper with PushPull outputs disabled. Configure Idle Stepper Step Pin, Idle Stepper Dir Pin, their modes, and the optional enable input in Stepper Controller Hardware.
Dual H bridge
Enable Drive stepper with dual H bridges and configure the two Stepper H-Bridge Hardware channels. Each channel uses its direction pins and optional disable output. Inversion and micro-stepping controls apply only when supported by that hardware.
PushPull outputs
Enable Drive stepper with PushPull outputs and assign Stepper A+, A-, B+, and B-. The runtime groups A+/A- and B+/B- as two phases. Verify the board's output circuit and current path before connecting external hardware.
The Universal 112 v1.2 pinout documents that revision's onboard stepper driver and outputs unavailable while it is used. Other boards and revisions need their own documentation.